Answer
$\begin {bmatrix} 5&-4 \\ 5& 0 \end {bmatrix}$
Work Step by Step
In order to subtract two matrices, they must have same dimensions.
Since, the given matrices have same dimensions, so they can be added.
Subtracting the given matrices to obtain:
$\begin {bmatrix} 0&2 \\ -4&-1 \end {bmatrix} - \begin {bmatrix} -5&6 \\ -9&-1 \end {bmatrix} \\=\begin {bmatrix} 0-(-5)&2-6 \\-4-(-9)& -1-(-1) \end {bmatrix} \\=\begin {bmatrix} 5&-4 \\ 5& 0 \end {bmatrix}$
